OESD

(Open-Ended Straight Draw)
draws

A straight draw with two ranks completing it (8 outs).

OESDs have ~32% equity from flop to river. Strong semi-bluff candidates, especially with extra equity (overcards, backdoor flush).

See also

Backdoor
A draw needing two perfect cards (turn + river) to complete.
Drawing Dead
Having no card left in the deck that can win the hand.
Flush Draw
Four cards of the same suit, needing one more for a flush.
Gutshot
An inside straight draw — needing one specific rank (4 outs).